LG 42LG61YD, Руководство по обслуживанию

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- 21 - LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
6. HDMI doesn’t display
Check input c onnect J900 , J901, J902
Can you see t he normal wavefo rm?
Check DD C commu nication lin es(IC900,
IC901, IC903 Pin 5,6)
Check th e in pu t o f HDMI Seitch (IC902)
This sign al is TMDS.
Can you see t he normal wavefo rm?
YES
YES
NO
J900 , J90 1, J902
may have problem. Rep lace th is Jack.
Check th e output of HDMI Switc h(IC902).
Can you see t he normal wavefo rm?
YES
YES
NO
After ch eckin g th e trace o f TMDS lin es and po wer of
HDMI Switch, you should decide to replace HDMI
Switch or not .
NO
NO
After ch eckin g th e Power of th is ch ip , you
should decide to replace this or not.
After ch eckin g th e Power of HDMI S witch y ou
should decide to replace MST3361 or not.
YES
Check HD CP co mmu nicatio n lin es(IC902)
NO
After ch eckin g th e Power of th is ch ip , you
should decide to replace this or not.
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
NO
After ch eckin g th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace Main Bo ard or no t.